Futures Explained

A futures contract locks in a price today for an asset to be bought or sold later, and because that market runs longer hours than the underlying cash market, it often shows where prices are heading before the opening bell.

Locking in a price for later

A futures contract is a standardized agreement to buy or sell a specific asset — a stock index, a commodity, a currency, a bond — at a set price on a set future date. Unlike a simple forward agreement between two private parties, futures trade on organized exchanges with standardized contract sizes and expiration dates, and a clearinghouse guarantees both sides of the trade, which is what makes the market liquid and accessible to a wide range of participants.

Futures exist for two very different reasons: hedging and speculation. A farmer can lock in a selling price for a harvest months before it is ready, protecting against a price drop. An airline can lock in a fuel price to protect its budget from an oil spike. Neither party intends to profit from a price forecast; they are transferring risk they would rather not carry.

Leverage and margin

Futures are traded on margin, meaning a trader posts only a fraction of the contract's full value as collateral to control the entire position. That leverage cuts both ways: gains and losses are calculated on the full contract value, not just the margin posted, which means a relatively small price move can produce an outsized gain or loss relative to the capital put down. This is a core reason futures are considered a higher-risk instrument than owning the underlying asset outright.

Speculators use that leverage deliberately, taking a view on where prices are headed without needing to own or store the physical asset. A trader betting oil prices will rise does not need a tanker; they simply buy an oil futures contract and post the required margin.

Why futures often move before the cash market

Equity index futures, such as those tracking the S&P 500 or Nasdaq, trade nearly around the clock, well beyond the hours the underlying stock exchange is open. When significant news breaks overnight — an economic release, a geopolitical event, a surprise earnings report — futures react immediately, giving traders a real-time read on how the cash market is likely to open the next session. That is why financial media routinely cite "futures are up" or "futures are down" before the opening bell: it is the earliest available signal of where sentiment stands.

This lead-lag relationship is not a prediction guarantee — futures pricing can and does shift again once the cash market opens and full trading volume returns — but it remains one of the most closely watched pre-market indicators across asset classes.